GENERAL DESCRIPTION

The AD5255 provides a dual 512 position and a single 128 position digitally controlled variable resistors1 (VR) in a TSSOP package. This device performs the same electronic adjustment function as a potentiometer, trimmer, or VR. Each VR offers a completely programmable value of resistance between the A terminal and the wiper or the B terminal and the wiper. The fixed A-to-B terminal resistance of 25 kΩ or 250 kΩ has a 1 channel-to-channel matching tolerance and a nominal temperature coefficient of 35 ppm/°C.

FEATURES

3 channels

Dual 512 position

Single 128 position

25 kΩ or 250 kΩ full-scale resistance

Low temperature coefficient

Potentiometer divider 15 ppm/°C

Rheostat mode 35 ppm/°C

Nonvolatile memory retains wiper settings

Permanent memory write protection

Linear increment/decrement

±6 dB increment/decrement

I2C-compatible serial interface

2.7 V to 5.5 V single-supply operation

±2.25 V to ±2.75 V dual-supply operation

Power-on reset time

256 bytes general-purpose user EEPROM

11 bytes RDAC user EEPROM

GBIC and SFP compliant EEPROM

100-year typical data retention at TA = 55°C

APPLICATIONS

Mechanical potentiometer replacement

RGB LED backlight controls

White LED brightness adjustment

Programmable gain and offset controls

Programmable filters